content: /* Copyright (C) 2016-2018 Alibaba Group Holding Limited
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  
  // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import protobuf_unittest.UnittestOptimizeFor;
  import protobuf_unittest.UnittestOptimizeFor.TestOptimizedForSize;
  import protobuf_unittest.UnittestOptimizeFor.TestRequiredOptimizedForSize;
  import protobuf_unittest.UnittestProto;
  import protobuf_unittest.UnittestProto.ForeignMessage;
  import protobuf_unittest.UnittestProto.TestAllTypes;
  import protobuf_unittest.UnittestProto.TestEmptyMessage;
  import protobuf_unittest.UnittestProto.TestParsingMerge;
  import protobuf_unittest.UnittestProto.TestRequired;
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InterruptedIOException;
  import junit.framework.TestCase;
  
  /**
   * Unit test for {@link Parser}.
   *
   * @author liujisi@google.com (Pherl Liu)
   */
  public class ParserTest extends TestCase {
    public void testGeneratedMessageParserSingleton() throws Exception {
      for (int i = 0; i < 10; i++) {
        assertEquals(TestAllTypes.parser(), TestUtil.getAllSet().getParserForType());
      }
    }
  
    private void assertRoundTripEquals(MessageLite message,
                                       ExtensionRegistryLite registry)
        throws Exception {
      final byte[] data = message.toByteArray();
      final int offset = 20;
      final int length = data.length;
      final int padding = 30;
      Parser<? extends MessageLite> parser = message.getParserForType();
      assertMessageEquals(message, parser.parseFrom(data, registry));
      assertMessageEquals(message, parser.parseFrom(
          generatePaddingArray(data, offset, padding),
          offset, length, registry));
      assertMessageEquals(message, parser.parseFrom(
          message.toByteString(), registry));
      assertMessageEquals(message, parser.parseFrom(
          new ByteArrayInputStream(data), registry));
      assertMessageEquals(message, parser.parseFrom(
          CodedInputStream.newInstance(data), registry));
      assertMessageEquals(
          message, parser.parseFrom(message.toByteString().asReadOnlyByteBuffer(), registry));
    }
  
    @SuppressWarnings("unchecked")
    private void assertRoundTripEquals(MessageLite message) throws Exception {
      final byte[] data = message.toByteArray();
      final int offset = 20;
      final int length = data.length;
      final int padding = 30;
  
      Parser<MessageLite> parser =
          (Parser<MessageLite>) message.getParserForType();
      assertMessageEquals(message, parser.parseFrom(data));
      assertMessageEquals(message, parser.parseFrom(
          generatePaddingArray(data, offset, padding),
          offset, length));
      assertMessageEquals(message, parser.parseFrom(message.toByteString()));
      assertMessageEquals(message, parser.parseFrom(
          new ByteArrayInputStream(data)));
      assertMessageEquals(message, parser.parseFrom(
          CodedInputStream.newInstance(data)));
      assertMessageEquals(message, parser.parseFrom(message.toByteString().asReadOnlyByteBuffer()));
    }
  
    private void assertMessageEquals(
        MessageLite expected, MessageLite actual)
        throws Exception {
      if (expected instanceof Message) {
        assertEquals(expected, actual);
      } else {
        assertEquals(expected.toByteString(), actual.toByteString());
      }
    }
  
    private byte[] generatePaddingArray(byte[] data, int offset, int padding) {
      byte[] result = new byte[offset + data.length + padding];
      System.arraycopy(data, 0, result, offset, data.length);
      return result;
    }
  
    public void testNormalMessage() throws Exception {
      assertRoundTripEquals(TestUtil.getAllSet());
    }
  
  
    public void testParsePartial() throws Exception {
      assertParsePartial(TestRequired.parser(), TestRequired.newBuilder().setA(1).buildPartial());
    }
  
    private <T extends MessageLite> void assertParsePartial(
        Parser<T> parser, T partialMessage) throws Exception {
      final String errorString =
          "Should throw exceptions when the parsed message isn't initialized.";
  
      // parsePartialFrom should pass.
      byte[] data = partialMessage.toByteArray();
      assertEquals(partialMessage, parser.parsePartialFrom(data));
      assertEquals(partialMessage, parser.parsePartialFrom(
          partialMessage.toByteString()));
      assertEquals(partialMessage, parser.parsePartialFrom(
          new ByteArrayInputStream(data)));
      assertEquals(partialMessage, parser.parsePartialFrom(
          CodedInputStream.newInstance(data)));
  
      // parseFrom(ByteArray)
      try {
        parser.parseFrom(partialMessage.toByteArray());
        fail(errorString);
      } catch (InvalidProtocolBufferException e) {
        // pass.
      }
  
      // parseFrom(ByteString)
      try {
        parser.parseFrom(partialMessage.toByteString());
        fail(errorString);
      } catch (InvalidProtocolBufferException e) {
        // pass.
      }
  
      // parseFrom(InputStream)
      try {
        parser.parseFrom(new ByteArrayInputStream(partialMessage.toByteArray()));
        fail(errorString);
      } catch (IOException e) {
        // pass.
      }
  
      // parseFrom(CodedInputStream)
      try {
        parser.parseFrom(CodedInputStream.newInstance(
            partialMessage.toByteArray()));
        fail(errorString);
      } catch (IOException e) {
        // pass.
      }
    }
  
    public void testParseExtensions() throws Exception {
      assertRoundTripEquals(TestUtil.getAllExtensionsSet(),
                            TestUtil.getExtensionRegistry());
    }
  
    public void testParsePacked() throws Exception {
      assertRoundTripEquals(TestUtil.getPackedSet());
      assertRoundTripEquals(TestUtil.getPackedExtensionsSet(),
                            TestUtil.getExtensionRegistry());
    }
  
    public void testParseDelimitedTo() throws Exception {
      // Write normal Message.
      TestAllTypes normalMessage = TestUtil.getAllSet();
      ByteArrayOutputStream output = new ByteArrayOutputStream();
      normalMessage.writeDelimitedTo(output);
      normalMessage.writeDelimitedTo(output);
  
      InputStream input = new ByteArrayInputStream(output.toByteArray());
      assertMessageEquals(normalMessage, normalMessage.getParserForType().parseDelimitedFrom(input));
      assertMessageEquals(normalMessage, normalMessage.getParserForType().parseDelimitedFrom(input));
    }
  
    public void testParseUnknownFields() throws Exception {
      // All fields will be treated as unknown fields in emptyMessage.
      TestEmptyMessage emptyMessage =
          TestEmptyMessage.parser().parseFrom(TestUtil.getAllSet().toByteString());
      assertEquals(
          TestUtil.getAllSet().toByteString(),
          emptyMessage.toByteString());
    }
  
  
    public void testOptimizeForSize() throws Exception {
      TestOptimizedForSize.Builder builder = TestOptimizedForSize.newBuilder();
      builder.setI(12).setMsg(ForeignMessage.newBuilder().setC(34).build());
      builder.setExtension(TestOptimizedForSize.testExtension, 56);
      builder.setExtension(TestOptimizedForSize.testExtension2,
          TestRequiredOptimizedForSize.newBuilder().setX(78).build());
  
      TestOptimizedForSize message = builder.build();
      ExtensionRegistry registry = ExtensionRegistry.newInstance();
      UnittestOptimizeFor.registerAllExtensions(registry);
  
      assertRoundTripEquals(message, registry);
    }
  
    /** Helper method for {@link #testParsingMerge()}.*/
    private void assertMessageMerged(TestAllTypes allTypes)
        throws Exception {
      assertEquals(3, allTypes.getOptionalInt32());
      assertEquals(2, allTypes.getOptionalInt64());
      assertEquals("hello", allTypes.getOptionalString());
    }
  
    public void testParsingMerge() throws Exception {
      // Build messages.
      TestAllTypes.Builder builder = TestAllTypes.newBuilder();
      TestAllTypes msg1 = builder.setOptionalInt32(1).build();
      builder.clear();
      TestAllTypes msg2 = builder.setOptionalInt64(2).build();
      builder.clear();
      TestAllTypes msg3 = builder.setOptionalInt32(3)
          .setOptionalString("hello").build();
  
      // Build groups.
      TestParsingMerge.RepeatedFieldsGenerator.Group1 optionalG1 =
          TestParsingMerge.RepeatedFieldsGenerator.Group1.newBuilder()
          .setField1(msg1).build();
      TestParsingMerge.RepeatedFieldsGenerator.Group1 optionalG2 =
          TestParsingMerge.RepeatedFieldsGenerator.Group1.newBuilder()
          .setField1(msg2).build();
      TestParsingMerge.RepeatedFieldsGenerator.Group1 optionalG3 =
          TestParsingMerge.RepeatedFieldsGenerator.Group1.newBuilder()
          .setField1(msg3).build();
      TestParsingMerge.RepeatedFieldsGenerator.Group2 repeatedG1 =
          TestParsingMerge.RepeatedFieldsGenerator.Group2.newBuilder()
          .setField1(msg1).build();
      TestParsingMerge.RepeatedFieldsGenerator.Group2 repeatedG2 =
          TestParsingMerge.RepeatedFieldsGenerator.Group2.newBuilder()
          .setField1(msg2).build();
      TestParsingMerge.RepeatedFieldsGenerator.Group2 repeatedG3 =
          TestParsingMerge.RepeatedFieldsGenerator.Group2.newBuilder()
          .setField1(msg3).build();
  
      // Assign and serialize RepeatedFieldsGenerator.
      ByteString data = TestParsingMerge.RepeatedFieldsGenerator.newBuilder()
          .addField1(msg1).addField1(msg2).addField1(msg3)
          .addField2(msg1).addField2(msg2).addField2(msg3)
          .addField3(msg1).addField3(msg2).addField3(msg3)
          .addGroup1(optionalG1).addGroup1(optionalG2).addGroup1(optionalG3)
          .addGroup2(repeatedG1).addGroup2(repeatedG2).addGroup2(repeatedG3)
          .addExt1(msg1).addExt1(msg2).addExt1(msg3)
          .addExt2(msg1).addExt2(msg2).addExt2(msg3)
          .build().toByteString();
  
      // Parse TestParsingMerge.
      ExtensionRegistry registry = ExtensionRegistry.newInstance();
      UnittestProto.registerAllExtensions(registry);
      TestParsingMerge parsingMerge = TestParsingMerge.parser().parseFrom(data, registry);
  
      // Required and optional fields should be merged.
      assertMessageMerged(parsingMerge.getRequiredAllTypes());
      assertMessageMerged(parsingMerge.getOptionalAllTypes());
      assertMessageMerged(
          parsingMerge.getOptionalGroup().getOptionalGroupAllTypes());
      assertMessageMerged(parsingMerge.getExtension(
          TestParsingMerge.optionalExt));
  
      // Repeated fields should not be merged.
      assertEquals(3, parsingMerge.getRepeatedAllTypesCount());
      assertEquals(3, parsingMerge.getRepeatedGroupCount());
      assertEquals(3, parsingMerge.getExtensionCount(
          TestParsingMerge.repeatedExt));
    }
  
    public void testParseDelimitedFrom_firstByteInterrupted_preservesCause() {
      try {
        TestUtil.getAllSet().parseDelimitedFrom(
            new InputStream() {
              @Override
              public int read() throws IOException {
                throw new InterruptedIOException();
              }
            });
        fail("Expected InterruptedIOException");
      } catch (Exception e) {
        assertEquals(InterruptedIOException.class, e.getClass());
      }
    }
  
    public void testParseDelimitedFrom_secondByteInterrupted_preservesCause() {
      try {
        TestUtil.getAllSet().parseDelimitedFrom(
            new InputStream() {
              private int i;
  
              @Override
              public int read() throws IOException {
                switch (i++) {
                  case 0:
                    return 1;
                  case 1:
                    throw new InterruptedIOException();
                  default:
                    throw new AssertionError();
                }
              }
            });
        fail("Expected InterruptedIOException");
      } catch (Exception e) {
        assertEquals(InterruptedIOException.class, e.getClass());
      }
    }
  }
  